Uniformly convergent hybrid schemes for solutions and derivatives in quasilinear singularly perturbed BVPs

Uniformly convergent hybrid schemes for solutions and derivatives in quasilinear singularly perturbed BVPs
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拟线性奇异摄动 BVP 中解和导数的一致收敛混合格式

DOI:
10.1016/j.apnum.2014.12.010
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发表时间:
2015-05
影响因子:
2.8
通讯作者:
Yue Gao
Yue Gao
中科院分区:
数学2区
文献类型:
--
作者:
Quan Zheng;Xuezheng Li;Yue Gao

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本文提出了一类在 Bakhvalov-Shishkin 网格上具有可变权重的混合差分格式来计算拟线性奇异扰动对流扩散边值问题的解和导数。利用(l∞,l 1)-稳定性性质清楚地证明了巴赫瓦洛夫-希什金网格上的近似解和导数的参数一致二阶收敛性以及希什金网格上的近二阶收敛性,其中均匀收敛的充分条件在巴赫瓦洛夫-希什金网格上被适度放宽,并在希什金网格上得到了澄清。数值例子通过新的充分条件及其误差估计支持所提出的方案。
In this paper, a class of hybrid difference schemes with variable weights on Bakhvalov–Shishkin mesh is proposed to compute both the solution and the derivative in quasilinear singularly perturbed convection–diffusion boundary value problems. The parameter-uniform second-order convergence of approximating to the solution and the derivative on Bakhvalov–Shishkin mesh and that of nearly second-order on Shishkin mesh are proved clearly by use of an (l∞, l 1)-stability property, where the former sufficient conditions for uniform convergence are modestly relaxed on Bakhvalov–Shishkin mesh and are clarified on Shishkin mesh. The numerical examples support the proposed schemes with new sufficient conditions and their error estimates.
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